GB506667A - Improvements in or relating to the production of diffration gratings and of multi-colour screens for use in colour photography - Google Patents
Improvements in or relating to the production of diffration gratings and of multi-colour screens for use in colour photographyInfo
- Publication number
- GB506667A GB506667A GB33274/37A GB3327437A GB506667A GB 506667 A GB506667 A GB 506667A GB 33274/37 A GB33274/37 A GB 33274/37A GB 3327437 A GB3327437 A GB 3327437A GB 506667 A GB506667 A GB 506667A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- lines
- screen
- produce
- exposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/04—Additive processes using colour screens; Materials therefor; Preparing or processing such materials
- G03C7/06—Manufacture of colour screens
- G03C7/10—Manufacture of colour screens with regular areas of colour, e.g. bands, lines, dots
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
506,667. Colour photography; diffraction gratings. SEASE, V. B. Dec. 1, 1937, No. 33274. Convention date, Dec. 7, 1936. [Classes 97 (i) and 98 (ii)] A screen formed of fine lines, such as a multicolour screen, or a diffraction grating leaving coloured lines, is produced by exposing closelyadjacent separated areas of a moving lightsensitive band to a strip of light or other radiation extending transversely or obliquely to the direction of movement of the band, the light being modulated to give intermittent flashes at high frequency in order to produce alternating exposed and unexposed lines on the layer, and converting the exposed lines into lines of colour. To produce a two-colour screen the unexposed lines may be exposed and converted to a second colour. To produce a three-colour screen an intermediate esposure is given to the moving band by means of the modulated light-strip to produce alternating exposed and unexposed lines crossing the first set of lines, the exposed lines being converted to lines of a second colour, and the remaining uncoloured spaces being converted into areas of a third colour. A four-colour screen may similarly be produced by three exposures with the slit at, different angles, Reference is made to apparatus for light modulation sumilar to that used for recording a variable-density sound track in order to produce a screen of mesh 1000 lines per inch. For producing the colours, a silver halide emulsion may be used which may be chemically or dye toned, or may be developed with colour developers after the various exposures, e.g. for red, a developer compounded from thioindoxyl-carboxylic acid in acetone, and mono - ethyl-para - phenylenediamine hydrochloride, potassium carbonate and sodium sulphite in water ; for blue a developer compounded from alpha-naphthol in acetone and dimethyl-para-phenylenediamine hydrochloride, potassium carbonate and sodium sulphite ; and for green a developer compounded from 2 : 3 : 4 trichlor-alpha-naphthol and alphachlor-ethylacetate in acetone, and diethyl-paraphenylenediamine hydrochloride, potassium carbonate and sodium sulphite in water. The silver images are removed by forricyanide and hypo, either in the same or in separate solutions. The ratio of the aggregates of the coloured areas may be varied by exposure conditions to obtain the desired balance of colours. The method may be used to produce two-, three., and four-colour screens of various patterns. For the successive exposures the layer may be treated with a resensitizing bath, e.g. sodium sulphite. The finished screen may be covered with varnish overcoated with sensitive emulsion. British Specifications 15055/12 and 2562/13, [both in Class 98 (ii)], and U.S.A. Specification 1,102,028 are referred to. The Specification as open to inspection under Sect. 91 refers also to the use, instead of a silver halide layer, of a layer sensitized with bichromate, iron salts, diazo compounds, &c. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US506667X | 1936-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB506667A true GB506667A (en) | 1939-06-01 |
Family
ID=21966637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33274/37A Expired GB506667A (en) | 1936-12-07 | 1937-12-01 | Improvements in or relating to the production of diffration gratings and of multi-colour screens for use in colour photography |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB506667A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138588A (en) * | 1983-04-19 | 1984-10-24 | Barr & Stroud Ltd | Optical Grating for Displacement Sensor |
-
1937
- 1937-12-01 GB GB33274/37A patent/GB506667A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138588A (en) * | 1983-04-19 | 1984-10-24 | Barr & Stroud Ltd | Optical Grating for Displacement Sensor |
FR2544875A1 (en) * | 1983-04-19 | 1984-10-26 | Barr & Stroud Ltd | OPTICAL DISPLACEMENT SENSOR |
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